📊 Feature: History-Sync vom Navidrome-Server (Phase 2, Part 5/X)

- Neue NavidromeService APIs: scrobble() + getBookmark()
- Lädt Wiedergabe-Position vom Server beim Song-Start (Subsonic-API)
- Sendet Position alle 5s zum Server wenn verbunden
- Priorisiert Server-Position über lokale Position
- Full Sync: lokal speichern + Server synchen parallel

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XJzQjUtnvYUtHdnTs3iCru

lib/player/audio_handler.dart

@@ -38,10 +38,15 @@ class MeloAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandler {
     _player.playbackEventStream.map(_transformEvent).pipe(playbackState);
 
     // Wiedergabeposition alle ~5s persistieren, solange aktiv abgespielt wird.
+    // Synche auch zum Server wenn verbunden.
     _positionRecordTimer = Timer.periodic(const Duration(seconds: 5), (_) {
       final songId = mediaItem.value?.extras?['songId'] as String?;
       if (_player.playing && songId != null) {
-        db.recordPlayback(songId, _player.position.inMilliseconds);
+        final posMs = _player.position.inMilliseconds;
+        db.recordPlayback(songId, posMs);
+        if (_nav.istVerbunden) {
+          _nav.scrobble(songId, (posMs ~/ 1000).toInt());
+        }
       }
     });
 
@@ -86,12 +91,28 @@ class MeloAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandler {
     await _player.setAudioSources(sources, initialIndex: startIndex);
 
     // Bei bekannter letzter Position an dieser Stelle fortsetzen,
-    // statt immer von vorne zu beginnen.
-    final songId = items[startIndex].extras?['songId'] as String?;
+    // statt immer von vorne zu beginnen. Priorisiert Server-Position über lokal.
+    final item = items[startIndex];
+    final songId = item.extras?['songId'] as String?;
     if (songId != null) {
-      final lastMs = await db.lastPosition(songId);
-      if (lastMs != null && shouldResumeAt(lastMs, items[startIndex].duration)) {
-        await _player.seek(Duration(milliseconds: lastMs), index: startIndex);
+      int? resumeMs;
+
+      if (_nav.istVerbunden) {
+        final serverMs = await _nav.getBookmark(songId);
+        if (serverMs != null && shouldResumeAt(serverMs, item.duration)) {
+          resumeMs = serverMs;
+        }
+      }
+
+      if (resumeMs == null) {
+        final localMs = await db.lastPosition(songId);
+        if (localMs != null && shouldResumeAt(localMs, item.duration)) {
+          resumeMs = localMs;
+        }
+      }
+
+      if (resumeMs != null) {
+        await _player.seek(Duration(milliseconds: resumeMs), index: startIndex);
       }
     }